<template>
  <div>
    <el-form
        v-loading="loading"
        element-loading-text="正在登录...."
        element-loading-spinner="el-icon-loading"
        element-loading-background="rgba(0,0,0,0.8)"
        :rules="rules"
        ref="loginForm"
        :model="loginForm"
        class="loginContainer">
      <!--   标题   -->
      <h3 class="loginTitle">系统登录</h3>
      <!-- 用户名 -->
      <el-form-item prop="username">
        <el-input type="text" auto-complete="false" v-model="loginForm.username" placeholder="请输入用户名"></el-input>
      </el-form-item>
      <!-- 密码 -->
      <el-form-item prop="password">
        <el-input type="password" auto-complete="false" v-model="loginForm.password" placeholder="请输入密码"></el-input>
      </el-form-item>
      <!-- 验证码 -->
      <el-form-item prop="code">
        <el-input
            style="width: 250px;margin-right: 5px"
            type="text"
            auto-complete="false"
            v-model="loginForm.code"
            placeholder="更换验证码"></el-input>
        <img :src="captchaUrl" @click="updateCaptcha">
      </el-form-item>
      <el-checkbox v-model="checked" class="loginRemember">记住我</el-checkbox>
      <el-button type="primary" style="width: 100%" @click="submitLogin">登录</el-button>
    </el-form>
  </div>
</template>

<script>


export default {
  name: "Login",
  data(){
    return {
      captchaUrl: '/captcha?time='+new Date(),   // 验证码路径
      checked: false,   // 记住我是否选中
      loading: false,
      // 登陆需要发送的参数
      loginForm:{
        username: 'admin',
        password: '456',
        code: ''
      },
      // 校验规则
      rules:{
        username: [{required:true, message: '请输入用户名', trigger: 'blur'},],
        password: [{required: true, message: '请输入密码', trigger: 'blur',}],
        code: [{required: true, message: '请输入验证码', trigger: 'blur'}]
      }
    }
  },
  methods:{
    // 点击验证码，更新验证码
    updateCaptcha(){
      this.captchaUrl = '/captcha?time='+new Date();
    },
    submitLogin(){
      this.$refs.loginForm.validate((valid)=>{
        if (valid){
          this.loading = true;
          // 输入的内容符合校验
          // 请求后端接口
          this.postRequest('/login', this.loginForm).then(resp=>{
            if (resp){
              this.loading = false;
              const tokenStr = resp.obj.tokenHead +" "+ resp.obj.token;
              // 存储用户Token
              window.sessionStorage.setItem("tokenStr",tokenStr);
              // 验证是否将信息存入浏览器会话内存
              if (window.sessionStorage.getItem('tokenStr') != null){
                // this.$router.replace('/home');
                // 跳转首页
                let path = this.$route.query.redirect;
                this.$router.replace((path == '/' || path == undefined ? '/home': path));
              }
            }else {
              // 刷新验证码
              this.updateCaptcha();
              // 取消loadding
              this.loading = false;
            }
          })
        }else {
          // 不符合校验
          this.$message.error("请输入所有字段");
          // 取消加载
          this.loading = false;
          return false;
        }

      });

    }
  },
}
</script>

<style >
  .loginContainer{
    border-radius: 15px;
    background-clip: padding-box;
    margin: 180px auto;
    width: 350px;
    padding: 15px 35px 35px;
    background: #fff;
    border: 1px solid #eaeaea;
    box-shadow: 0 0 25px #eac6c6;
  }
  .loginTitle{
    margin: 0px auto 40px auto;
    text-align: center;
  }
  .loginRemember{
    text-align: left;
    margin: 0px 0px 15px 0px;
  }

  .el-form-item__content{
    display: flex;
    align-items: center;
  }
</style>